From Copycat Recipe Guide

Panera Frontega Chicken Panini

While this copycat Panera Frontega Chicken Panini recipe did not come directly from the restaurant itself, the result comes quite close to what you will find at the bakery and cafe chain. The sandwich consists of smoked and pulled white meat chicken; mozzarella; tomatoes; red onions; and chopped basil and chipotle mayonnaise, grilled on focaccia bread.[1]